<?php
class SecurityUtil{
	
	private function __construct(){}
	
	public static function encrypt($message,$key = null){
		if(!$key && defined('CMSPAD_SECURITY_KEY')){
			$key = CMSPAD_SECURITY_KEY;
		}
		if($key){
			return self::StrToHex(self::des($key,urlencode(trim($message)),true));
		}else{
			return $message;
		}
	}
	
	public static function decrypt($message,$key = null){
		if(!$key && defined('CMSPAD_SECURITY_KEY')){
			$key = CMSPAD_SECURITY_KEY;
		}
		if($key){
			return urldecode(trim(self::des($key,self::HexToStr($message),false)));
		}else{
			return $message;
		}
	}
	
	private static function des($key,$message,$encrypt,$mode = 0,$iv = 0){
		$spfunction1 = array(0x1010400,0,0x10000,0x1010404,0x1010004,0x10404,0x4,0x10000,0x400,0x1010400,0x1010404,0x400,0x1000404,0x1010004,0x1000000,0x4,0x404,0x1000400,0x1000400,0x10400,0x10400,0x1010000,0x1010000,0x1000404,0x10004,0x1000004,0x1000004,0x10004,0,0x404,0x10404,0x1000000,0x10000,0x1010404,0x4,0x1010000,0x1010400,0x1000000,0x1000000,0x400,0x1010004,0x10000,0x10400,0x1000004,0x400,0x4,0x1000404,0x10404,0x1010404,0x10004,0x1010000,0x1000404,0x1000004,0x404,0x10404,0x1010400,0x404,0x1000400,0x1000400,0,0x10004,0x10400,0,0x1010004);
		$spfunction2 = array(-0x7fef7fe0,-0x7fff8000,0x8000,0x108020,0x100000,0x20,-0x7fefffe0,-0x7fff7fe0,-0x7fffffe0,-0x7fef7fe0,-0x7fef8000,-0x80000000,-0x7fff8000,0x100000,0x20,-0x7fefffe0,0x108000,0x100020,-0x7fff7fe0,0,-0x80000000,0x8000,0x108020,-0x7ff00000,0x100020,-0x7fffffe0,0,0x108000,0x8020,-0x7fef8000,-0x7ff00000,0x8020,0,0x108020,-0x7fefffe0,0x100000,-0x7fff7fe0,-0x7ff00000,-0x7fef8000,0x8000,-0x7ff00000,-0x7fff8000,0x20,-0x7fef7fe0,0x108020,0x20,0x8000,-0x80000000,0x8020,-0x7fef8000,0x100000,-0x7fffffe0,0x100020,-0x7fff7fe0,-0x7fffffe0,0x100020,0x108000,0,-0x7fff8000,0x8020,-0x80000000,-0x7fefffe0,-0x7fef7fe0,0x108000);
		$spfunction3 = array(0x208,0x8020200,0,0x8020008,0x8000200,0,0x20208,0x8000200,0x20008,0x8000008,0x8000008,0x20000,0x8020208,0x20008,0x8020000,0x208,0x8000000,0x8,0x8020200,0x200,0x20200,0x8020000,0x8020008,0x20208,0x8000208,0x20200,0x20000,0x8000208,0x8,0x8020208,0x200,0x8000000,0x8020200,0x8000000,0x20008,0x208,0x20000,0x8020200,0x8000200,0,0x200,0x20008,0x8020208,0x8000200,0x8000008,0x200,0,0x8020008,0x8000208,0x20000,0x8000000,0x8020208,0x8,0x20208,0x20200,0x8000008,0x8020000,0x8000208,0x208,0x8020000,0x20208,0x8,0x8020008,0x20200);
		$spfunction4 = array(0x802001,0x2081,0x2081,0x80,0x802080,0x800081,0x800001,0x2001,0,0x802000,0x802000,0x802081,0x81,0,0x800080,0x800001,0x1,0x2000,0x800000,0x802001,0x80,0x800000,0x2001,0x2080,0x800081,0x1,0x2080,0x800080,0x2000,0x802080,0x802081,0x81,0x800080,0x800001,0x802000,0x802081,0x81,0,0,0x802000,0x2080,0x800080,0x800081,0x1,0x802001,0x2081,0x2081,0x80,0x802081,0x81,0x1,0x2000,0x800001,0x2001,0x802080,0x800081,0x2001,0x2080,0x800000,0x802001,0x80,0x800000,0x2000,0x802080);
		$spfunction5 = array(0x100,0x2080100,0x2080000,0x42000100,0x80000,0x100,0x40000000,0x2080000,0x40080100,0x80000,0x2000100,0x40080100,0x42000100,0x42080000,0x80100,0x40000000,0x2000000,0x40080000,0x40080000,0,0x40000100,0x42080100,0x42080100,0x2000100,0x42080000,0x40000100,0,0x42000000,0x2080100,0x2000000,0x42000000,0x80100,0x80000,0x42000100,0x100,0x2000000,0x40000000,0x2080000,0x42000100,0x40080100,0x2000100,0x40000000,0x42080000,0x2080100,0x40080100,0x100,0x2000000,0x42080000,0x42080100,0x80100,0x42000000,0x42080100,0x2080000,0,0x40080000,0x42000000,0x80100,0x2000100,0x40000100,0x80000,0,0x40080000,0x2080100,0x40000100);
		$spfunction6 = array(0x20000010,0x20400000,0x4000,0x20404010,0x20400000,0x10,0x20404010,0x400000,0x20004000,0x404010,0x400000,0x20000010,0x400010,0x20004000,0x20000000,0x4010,0,0x400010,0x20004010,0x4000,0x404000,0x20004010,0x10,0x20400010,0x20400010,0,0x404010,0x20404000,0x4010,0x404000,0x20404000,0x20000000,0x20004000,0x10,0x20400010,0x404000,0x20404010,0x400000,0x4010,0x20000010,0x400000,0x20004000,0x20000000,0x4010,0x20000010,0x20404010,0x404000,0x20400000,0x404010,0x20404000,0,0x20400010,0x10,0x4000,0x20400000,0x404010,0x4000,0x400010,0x20004010,0,0x20404000,0x20000000,0x400010,0x20004010);
		$spfunction7 = array(0x200000,0x4200002,0x4000802,0,0x800,0x4000802,0x200802,0x4200800,0x4200802,0x200000,0,0x4000002,0x2,0x4000000,0x4200002,0x802,0x4000800,0x200802,0x200002,0x4000800,0x4000002,0x4200000,0x4200800,0x200002,0x4200000,0x800,0x802,0x4200802,0x200800,0x2,0x4000000,0x200800,0x4000000,0x200800,0x200000,0x4000802,0x4000802,0x4200002,0x4200002,0x2,0x200002,0x4000000,0x4000800,0x200000,0x4200800,0x802,0x200802,0x4200800,0x802,0x4000002,0x4200802,0x4200000,0x200800,0,0x2,0x4200802,0,0x200802,0x4200000,0x800,0x4000002,0x4000800,0x800,0x200002);
		$spfunction8 = array(0x10001040,0x1000,0x40000,0x10041040,0x10000000,0x10001040,0x40,0x10000000,0x40040,0x10040000,0x10041040,0x41000,0x10041000,0x41040,0x1000,0x40,0x10040000,0x10000040,0x10001000,0x1040,0x41000,0x40040,0x10040040,0x10041000,0x1040,0,0,0x10040040,0x10000040,0x10001000,0x41040,0x40000,0x41040,0x40000,0x10041000,0x1000,0x40,0x10040040,0x1000,0x41040,0x10001000,0x40,0x10000040,0x10040000,0x10040040,0x10000000,0x40000,0x10001040,0,0x10041040,0x40040,0x10000040,0x10040000,0x10001000,0x10001040,0,0x10041040,0x41000,0x41000,0x1040,0x1040,0x40040,0x10000000,0x10041000);
		$masks = array(4294967295,2147483647,1073741823,536870911,268435455,134217727,67108863,33554431,16777215,8388607,4194303,2097151,1048575,524287,262143,131071,65535,32767,16383,8191,4095,2047,1023,511,255,127,63,31,15,7,3,1,0);
		$keys = self::_desCreateKeys($key);
		$m = 0;
		$len = strlen($message);
		$chunk = 0;
		$iterations = ((count($keys) == 32)?3:9);
		if($iterations == 3){
			$looping = (($encrypt)?array(0,32,2):array(30,-2,-2));
		}else{
			$looping = (($encrypt)?array(0,32,2,62,30,-2,64,96,2):array(94,62,-2,32,64,2,30,-2,-2));
		}
		$message .= "        ";
		$result = "";
		$tempresult = "";
		
		if($mode == 1){
			$cbcleft = (ord($iv{$m++}) << 24) | (ord($iv{$m++}) << 16) | (ord($iv{$m++}) << 8) | ord($iv{$m++});
			$cbcright = (ord($iv{$m++}) << 24) | (ord($iv{$m++}) << 16) | (ord($iv{$m++}) << 8) | ord($iv{$m++});
			$m = 0;
		}
		while($m < $len){
			$left = (ord($message{$m++}) << 24) | (ord($message{$m++}) << 16) | (ord($message{$m++}) << 8) | ord($message{$m++});
			$right = (ord($message{$m++}) << 24) | (ord($message{$m++}) << 16) | (ord($message{$m++}) << 8) | ord($message{$m++});
			if($mode == 1){
				if($encrypt){
					$left ^= $cbcleft;
					$right ^= $cbcright;
				}else{
					$cbcleft2 = $cbcleft;
					$cbcright2 = $cbcright;
					$cbcleft = $left;
					$cbcright = $right;
				}
			}
			$temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f;
			$right ^= $temp;
			$left ^= ($temp << 4);
			$temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff;
			$right ^= $temp;
			$left ^= ($temp << 16);
			$temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333;
			$left ^= $temp;
			$right ^= ($temp << 2);
			$temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff;
			$left ^= $temp;
			$right ^= ($temp << 8);
			$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555;
			$right ^= $temp;
			$left ^= ($temp << 1);
			
			$left = (($left << 1) | ($left >> 31 & $masks[31]));
			$right = (($right << 1) | ($right >> 31 & $masks[31]));
			for($j = 0;$j < $iterations;$j += 3){
				$endloop = $looping[$j + 1];
				$loopinc = $looping[$j + 2];
				for($i = $looping[$j];$i != $endloop;$i += $loopinc){
					$right1 = $right ^ $keys[$i];
					$right2 = (($right >> 4 & $masks[4]) | ($right << 28 & 0xffffffff)) ^ $keys[$i + 1];
					$temp = $left;
					$left = $right;
					$right = $temp ^ ($spfunction2[($right1 >> 24 & $masks[24]) & 0x3f] | $spfunction4[($right1 >> 16 & $masks[16]) & 0x3f] | $spfunction6[($right1 >> 8 & $masks[8]) & 0x3f] | $spfunction8[$right1 & 0x3f] | $spfunction1[($right2 >> 24 & $masks[24]) & 0x3f] | $spfunction3[($right2 >> 16 & $masks[16]) & 0x3f] | $spfunction5[($right2 >> 8 & $masks[8]) & 0x3f] | $spfunction7[$right2 & 0x3f]);
				}
				$temp = $left;
				$left = $right;
				$right = $temp;
			}
			$left = (($left >> 1 & $masks[1]) | ($left << 31));
			$right = (($right >> 1 & $masks[1]) | ($right << 31));
			$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555;
			$right ^= $temp;
			$left ^= ($temp << 1);
			$temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff;
			$left ^= $temp;
			$right ^= ($temp << 8);
			$temp = (($right >> 2 & $masks[2]) ^ $left) & 0x33333333;
			$left ^= $temp;
			$right ^= ($temp << 2);
			$temp = (($left >> 16 & $masks[16]) ^ $right) & 0x0000ffff;
			$right ^= $temp;
			$left ^= ($temp << 16);
			$temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f;
			$right ^= $temp;
			$left ^= ($temp << 4);
			if($mode == 1){
				if($encrypt){
					$cbcleft = $left;
					$cbcright = $right;
				}else{
					$left ^= $cbcleft2;
					$right ^= $cbcright2;
				}
			}
			$tempresult .= (chr($left >> 24 & $masks[24]) . chr(($left >> 16 & $masks[16]) & 0xff) . chr(($left >> 8 & $masks[8]) & 0xff) . chr($left & 0xff) . chr($right >> 24 & $masks[24]) . chr(($right >> 16 & $masks[16]) & 0xff) . chr(($right >> 8 & $masks[8]) & 0xff) . chr($right & 0xff));
			
			$chunk += 8;
			if($chunk == 512){
				$result .= $tempresult;
				$tempresult = "";
				$chunk = 0;
			}
		}
		return ($result . $tempresult);
	}
	private static function _desCreateKeys($key){
		$oldErrorReporting = error_reporting(E_ERROR);
		$pc2bytes0 = array(0,0x4,0x20000000,0x20000004,0x10000,0x10004,0x20010000,0x20010004,0x200,0x204,0x20000200,0x20000204,0x10200,0x10204,0x20010200,0x20010204);
		$pc2bytes1 = array(0,0x1,0x100000,0x100001,0x4000000,0x4000001,0x4100000,0x4100001,0x100,0x101,0x100100,0x100101,0x4000100,0x4000101,0x4100100,0x4100101);
		$pc2bytes2 = array(0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808,0,0x8,0x800,0x808,0x1000000,0x1000008,0x1000800,0x1000808);
		$pc2bytes3 = array(0,0x200000,0x8000000,0x8200000,0x2000,0x202000,0x8002000,0x8202000,0x20000,0x220000,0x8020000,0x8220000,0x22000,0x222000,0x8022000,0x8222000);
		$pc2bytes4 = array(0,0x40000,0x10,0x40010,0,0x40000,0x10,0x40010,0x1000,0x41000,0x1010,0x41010,0x1000,0x41000,0x1010,0x41010);
		$pc2bytes5 = array(0,0x400,0x20,0x420,0,0x400,0x20,0x420,0x2000000,0x2000400,0x2000020,0x2000420,0x2000000,0x2000400,0x2000020,0x2000420);
		$pc2bytes6 = array(0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002,0,0x10000000,0x80000,0x10080000,0x2,0x10000002,0x80002,0x10080002);
		$pc2bytes7 = array(0,0x10000,0x800,0x10800,0x20000000,0x20010000,0x20000800,0x20010800,0x20000,0x30000,0x20800,0x30800,0x20020000,0x20030000,0x20020800,0x20030800);
		$pc2bytes8 = array(0,0x40000,0,0x40000,0x2,0x40002,0x2,0x40002,0x2000000,0x2040000,0x2000000,0x2040000,0x2000002,0x2040002,0x2000002,0x2040002);
		$pc2bytes9 = array(0,0x10000000,0x8,0x10000008,0,0x10000000,0x8,0x10000008,0x400,0x10000400,0x408,0x10000408,0x400,0x10000400,0x408,0x10000408);
		$pc2bytes10 = array(0,0x20,0,0x20,0x100000,0x100020,0x100000,0x100020,0x2000,0x2020,0x2000,0x2020,0x102000,0x102020,0x102000,0x102020);
		$pc2bytes11 = array(0,0x1000000,0x200,0x1000200,0x200000,0x1200000,0x200200,0x1200200,0x4000000,0x5000000,0x4000200,0x5000200,0x4200000,0x5200000,0x4200200,0x5200200);
		$pc2bytes12 = array(0,0x1000,0x8000000,0x8001000,0x80000,0x81000,0x8080000,0x8081000,0x10,0x1010,0x8000010,0x8001010,0x80010,0x81010,0x8080010,0x8081010);
		$pc2bytes13 = array(0,0x4,0x100,0x104,0,0x4,0x100,0x104,0x1,0x5,0x101,0x105,0x1,0x5,0x101,0x105);
		$masks = array(4294967295,2147483647,1073741823,536870911,268435455,134217727,67108863,33554431,16777215,8388607,4194303,2097151,1048575,524287,262143,131071,65535,32767,16383,8191,4095,2047,1023,511,255,127,63,31,15,7,3,1,0);
		$iterations = ((strlen($key) > 8)?3:1);
		$keys = array();
		$shifts = array(0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0);
		$m = 0;
		$n = 0;
		
		for($j = 0;$j < $iterations;$j++){
			$left = (ord($key{$m++}) << 24) | (ord($key{$m++}) << 16) | (ord($key{$m++}) << 8) | ord($key{$m++});
			$right = (ord($key{$m++}) << 24) | (ord($key{$m++}) << 16) | (ord($key{$m++}) << 8) | ord($key{$m++});
			
			$temp = (($left >> 4 & $masks[4]) ^ $right) & 0x0f0f0f0f;
			$right ^= $temp;
			$left ^= ($temp << 4);
			$temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff;
			$left ^= $temp;
			$right ^= ($temp << 16);
			$temp = (($left >> 2 & $masks[2]) ^ $right) & 0x33333333;
			$right ^= $temp;
			$left ^= ($temp << 2);
			$temp = (($right >> 16 & $masks[16]) ^ $left) & 0x0000ffff;
			$left ^= $temp;
			$right ^= ($temp << 16);
			$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555;
			$right ^= $temp;
			$left ^= ($temp << 1);
			$temp = (($right >> 8 & $masks[8]) ^ $left) & 0x00ff00ff;
			$left ^= $temp;
			$right ^= ($temp << 8);
			$temp = (($left >> 1 & $masks[1]) ^ $right) & 0x55555555;
			$right ^= $temp;
			$left ^= ($temp << 1);
			$temp = ($left << 8) | (($right >> 20 & $masks[20]) & 0x000000f0);
			$left = ($right << 24) | (($right << 8) & 0xff0000) | (($right >> 8 & $masks[8]) & 0xff00) | (($right >> 24 & $masks[24]) & 0xf0);
			$right = $temp;
			for($i = 0;$i < count($shifts);$i++){
				if($shifts[$i] > 0){
					$left = (($left << 2) | ($left >> 26 & $masks[26]));
					$right = (($right << 2) | ($right >> 26 & $masks[26]));
				}else{
					$left = (($left << 1) | ($left >> 27 & $masks[27]));
					$right = (($right << 1) | ($right >> 27 & $masks[27]));
				}
				$left = $left & -0xf;
				$right = $right & -0xf;
				$lefttemp = $pc2bytes0[$left >> 28 & $masks[28]] | $pc2bytes1[($left >> 24 & $masks[24]) & 0xf] | $pc2bytes2[($left >> 20 & $masks[20]) & 0xf] | $pc2bytes3[($left >> 16 & $masks[16]) & 0xf] | $pc2bytes4[($left >> 12 & $masks[12]) & 0xf] | $pc2bytes5[($left >> 8 & $masks[8]) & 0xf] | $pc2bytes6[($left >> 4 & $masks[4]) & 0xf];
				$righttemp = $pc2bytes7[$right >> 28 & $masks[28]] | $pc2bytes8[($right >> 24 & $masks[24]) & 0xf] | $pc2bytes9[($right >> 20 & $masks[20]) & 0xf] | $pc2bytes10[($right >> 16 & $masks[16]) & 0xf] | $pc2bytes11[($right >> 12 & $masks[12]) & 0xf] | $pc2bytes12[($right >> 8 & $masks[8]) & 0xf] | $pc2bytes13[($right >> 4 & $masks[4]) & 0xf];
				$temp = (($righttemp >> 16 & $masks[16]) ^ $lefttemp) & 0x0000ffff;
				$keys[$n++] = $lefttemp ^ $temp;
				$keys[$n++] = $righttemp ^ ($temp << 16);
			}
		}
		error_reporting($oldErrorReporting);
		return $keys;
	}
	
	private static function StrToHex($s){
		$r = '';
		$hexes = array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f');
		for($i = 0,$l = strlen($s);$i < $l;$i++){
			$r .= ($hexes[(ord($s{$i}) >> 4)] . $hexes[(ord($s{$i}) & 0xf)]);
		}
		return $r;
	}
	
	private static function HexToStr($h){
		$r = '';
		for($i = 0,$l = strlen($h);$i < $l;$i += 2){
			$r .= chr(base_convert(substr($h,$i,2),16,10));
		}
		return $r;
	}
}
?>